Type-writing machine.



A. W.- SMITH.

TYPE WRIT ING MACHINE. APPLICATION FILED MAR. 11, 1910.

975, 1 69', Patented Nov. 8, 1910.

' 2 SHEETS-SHEET 1- ENTER WITNESEES:

Q H @KTURNEQ' A. W. SMITH. TYPE WRITING MACHINE. APPLICATION FILED MAR. 11, 1910.

975,169, Patented Nov. 8, 1910.

2 SHEETS-SHEET 2.

HISATTDRNEY UNITED STATES PATENT} OFFICE.

ARTHUR W. SMITH, OF NEW YORK, N. Y., ASSIGNOR TO YOST WRITING MACHINE COMPANY, OF ILION, NEW YORK, A CORPORATION OF NEW YORK.

TYPE-WRITING MACHINE.

Spchification of Letters Patent.

Patented Nov. 8, 1910.

Application filed March 11, 1910. Serial No. 548,579.

To all whom it may concern Be it known that l', Aa'rnua \V. Snrrn, citizen of the United States, and resident of the borough of lilanhattan, city of New York, inthe county of New York and State of New York, have invented certain new and useful linprovemcnls in "ypc-\Vrit1n g Machines, of which the fOllOWll'lg is a specl fication.

in My invention relates to typcwritiug inachines, and more. particularly to escapcmeat devices for such .i'nachincs.

Herctofore great objection hasbcen found in the noise produced, in the carriage cscapcn e' i't' n eeha iisn'i of typewriting nun clnn'c's,-'tjho noiseordlnarlly being most pronou'nc ei'l 'at each drop of the carriage in the letter space movements thereof.

One of the main objects of my invention is to provide simple and cllicient mechanism to overcome these ol'ijec'tions, the mechanism being so constructed as to great] y reduce or entirely eradicate the noise ordinarily pro;

I duccd by an operation of the escapcrnent devices;

To the above and other ends which will hereinafter appear, my invention consists .in the features of construction, combinations of devices and arrangements of parts to be hereinafter described and particularly pointed out in the appended claims.

In the accompanying drawings,wherein like reference characters indicate correspending; parts in. the various views Figure 1 is a vcrticah central, forevand aft sectional view of one form of typewriting machine Embodyin myjnvention. Fig. 2' is a fragmentary, detail, plan view, with parts in section, showing; the escapement devices and some of the associated parts.-

The present invention has certain of the 'same objects in view as the construction disclosed in a companion application filed by me of even date herewith and hearing Serial Number 548 578, the present invention being a modifi disclosed in my said companion application I have 'shoi'vn the in vcntion 'in the present instance embodied in a Yost visible mas chine, but it should be in'idcrstood that the invention may be embodied in various styles of typewriting' machines, and that the escapenient devices may be variously l; form of the. in vcntionr,

arranged,constructed and applied within certain aspects of my invention.

The frame of the machine comprises side plates 1, a rear cross plate 2, a front cross plate 3, and a top plate 4. Grooved carriage rails 5 are fixedly secured to the side plates of the machine and receive anti-friction balls or rollers (i which are likewise "received in t 1')1)osil'el v grooved rails 7. The rfds 7 are formed as a part of a. carriage 8 provided with upi-vardly extending end' plates S) to which parallcl'linlts 10 are pivoted at 11, the forward ends of" said links being; pivoted at 12 to a platen. frame 13 which supports a cylindrical platen 14- The carriage has pivoted thereto at- 15 depending arms 16 which carry at their lower ends a feed rack 17. The depending arms 16 are likewise provided with l'etll'wfil'tlly' extending arms 18 with which. leaf springs 19 cooperate to move the arms 16 forwardly around their p1votsto imuntain the feed rack 17 in mesh with. its cooperative feed.

pinion 20. The feed pinion 20 is fixed to a shaft 21 supported by a bracket arm 22 at the upper end portion thereof, the shaft being supported at its lower end portion by a bearing screw 23. An escapcmcnt rack 24, which, in the present insta-i'lcc, is shown as a circular rack' or cscapcnient' wheelyis 0pc 'atively connected to the shaft 21 by the usual clutchmechanism contained within a housing A spring drum 26 has a cord or band 27 connected at one end thereto, the other end of the band. being connected to the carriage to move it from right to left. across the machine under control of the escapement mechanism. I

liey levers 28 are pivoted at 29 to the auxiliary -Frame 30 secured to the main frame of the machine Each 'kcy lever is provided with afinger key 3.]. and is pivotally connected. to an upwardly extending); .linl'; 3,2

which in turn connected at its upper end to a forwardly extend-mg arm of an augulur lever 33 pivoted at 34' to a hanger -35.

The. upwardly projecting arm of each angular leveris conucetctll to the forward end of a pull link.3(i. which in turn is connected 'at its rear end to a driver 37 pivoted at 38 lo a hangcrflli. Each driverZ-li' is pivoted .inh-, rn|cdiatc its ends, as at 40, ton. type bar proper l1. The forward end of the type bar is pinned at 42 to a guide link 43, the rear or type carryii'ig end of the bar normally bearing against the face of an ink pad 44.

At each depression of a. finger key 31 the type carrying end of the associated type bar moves in a path indicated by the dotted line in Fig. 1, and strikes the front face of the' platen. The parts of each type action are assisted iii-their restoration to normal position by a restoring spring 45.

A universal bar 4.6 extends beneath the key levers and is adjustably connected to a rock shaft 47 by screws 48. The rock shaft is mounted oil-pivots 49 and 50 which are threaded into tapped openings in the side plates 1 of the frame. The right-hand pivot 50 is formed "with a circumferential shoulder 51, and the construction of the parts is such that the rock shaft or-dhg rocker 47 is adapted to receive an axial or sliding, as well as a pivotal, movement. A leaf spring 52 is secured at one end to the dog rocker by a screw 53, the leaf spring being bent to pass around to the end of thedog rocker, the spring being apertured at its free end to loosely rticeive the pivot 50. The spring resists the sliding movement of the dog rocker and is eit'ective to normally maintain it axially in the position shown in Fig. 2, the pressure of the spring being sufficient. toalmo t balance or to partly overcome the pressure of the carriage spring exerted through the escapement devices and to resist-the axial movement of the dog rocker- 'to the right and thus act. as a cushion for the dog rocker, for purposes which will hereinatlcr more clearly appear.

- carriage.

The dog roclt'er is provided with a rear \vardly' extending arm fii'provided with two fixed dogs-55 and 56 which are spaced apart, as indicated in Fig. 2, to cooperate with the esrapoment wheel 2% and to alford' a half andha'lt drop of ,tlie 'escapement wheel and .r f f -:-i-u'o miitlltfI-of the v brother is such that; a depression ofa finger key 31 is effective to turn the dog rocker 47 on its pivots to carry the normally engaged feed (log 56 out of the path of the engaged tooth (1. of the escaprnient wheel and to-int'erpose the deg 55 into the path of the previously engaged tooth of theescapement'wheel, thus all'ordiug a drop and half a letter space movement of the carriage on the depression of a linger key. ;\s 'the parts are restored to normal position, by a spring 57 connected at. one end to the dog rocker and at its opposite end to a. plate 58,- the dog 56 will lowered into the path of the next;oncoming' .tooth. ll of the escapement wheel and the dog 55 will be disel'igaged from the tooth a,.t'hus' all'ortling another half drop of theesca1mment wheel to complete the letter space travel of tlurcarriage. This is the general mitomaticall absorb'=the'.-s,i'dok ineide ads; the construction 26 is, or may be,efl"ective to slightly flex the spring 52 when the parts are'in normal position, although the pressure of the sprin drum is insufficient at any time to flex tie spring 52 to its fullest extent. The depression of a finger ,key is effective to afford an actuation of the escapement mechanism in the manner'hereinbefore described. At each drop of a tooth of the escapement wheel from one dog to the other, the impact between the tooth of the wheel and the cooperative feed dog is effective to slide the dog rocker as a Whole and cause it. to move in unison with the carriage a ainst the pressure of the spring -52,'Whici absorbs the shock, so that the shock is not transmitted to the point of final resistance, which in the present instance would be the shouldered pivot 50 and the frame of the machine to which it is fixed. It will be seen that the shock, due to the letter feed movements of the carriage, is absorbed at each half drop of the escapemeiit wheel so that the spring 52 is efi'eetive to greatly reduce, or to entirely eradicate, the noise ordinarily incident to an actuation of timescapement mechanism and to the pounding 100 or im act of the .eseapement wheel on the feed ogs atthe termination 'of the letter space movements of the carriage. The flexure of the spring 52 under impact of the eseapement wheel on the feed dogs may 105 vary in degree, depending on the manner in which the escapement mechanism is' actuated, but in all cases the construction will and resili'entlyt j1 so to speak,

movementsbf 't-liecerr e ---a1 "e pact of the teeth of the escapement 'wheel 'on'the feed dogs.

\Vhile ordinarily the spring 52 wholly re sists'the movement of the carriage under power ofthe spring drum thereofand as a. consequence constitutes a cushion or resilient support for the carriage, yet in excep-- tional circumstances the dog rocker .will be right-hand end of the dog rocker intoj contact with the shoulder 51 n-n-dthus positively arrest the dog rocker and the carriage. This action, however, only takes place on rare oec'asions asjwhen a positive pressure 125 is 'ejiertcd,by hand or otherwise, to move the carriage in the direction .of 'its'feed while'the fed rack 17 is engaged with its cooperative pinion. The ()SllZlVe arrest of the dog rockerwithtlie-s oulder .51 tl e ge 1 31i .moved far enough to the right to bring thebodied therein.

fore only takes place in exec itional circumstances and is intended only to .act as a safety device to prevent an over-flexing of the spring 52 and to prevent any injury which might result therefrom.

he'n I refer herein to a spring or cushion in connection with the part 52 it should. be understood that these terms are employed in a generic sense and are intended to include any resilient. or flexible mem her which performs the function of the spring 52.

It will he observed that the devices of my invention are simple in construction and etiicient in use, and that my invention may be readily embodied in existing forms of typewriting machines without changing, or materially changing, the constructions cm- In short, the simple addition of the leafspring 52 and an adjust ment. of the pivot 50 is all that is required to embody the invention in the present construction of Yost visible machines.

\Vhat I claim-as-new and desire to secure by Letters Patent, is:

1. In a typewriting machine, the combination of a power driven carriage; escapement devices including a feed dog, a dog rocker to which'said dog is rigidly secured, and a rack; a spring; and means by which said spring isrendered effective to absorb the shock incidental to the letter feed movements of the carriage and when said rack is in engagement with said rigidly secured dog.

2. In a typewriting machine, the combina tion of a power driven carriage; cscapement devices including feed dogs, a dog rocker to which said dogs are rigidly secured, and a rack; a spring; and means whereby said spring is effective to absorb the shock incidental to the relative letter feed movement between the rack and feed dogs and incidental to the impact of one of said last mentioned parts on the other..

3. In atypewriting machine, the combination of a power driven carriage, escapement devices which afford free movements of the carriage at letter 'feed operations, a spring separate from "said escapement devices, and

means whereby said spring is flexed and thereby arrests the carriage after each free letter feed movement thereof and after the said escapement devices have been brought into engagement to arrest the carriage.

4. In a typewriting machine, the coinbina: tion ofa power driven carriageresca-pemeht devices therefor including a holding dog and a rack which aflord free movements of the carriage at letter space; operations, one of said parts being mountedv for bodily movement after they are,engaged,'to arrest the carriage; and 1a springse'parate from said movably mounted part and operative to-rcsistthe movement thercm aficr'a h-itter feed movement of thecarriage has taken place eseapement d og';.-a dog rocker n'iounted for movement m unison with the :arriage and under the pressure of the power employed to move the carriage; and a spring to resist such movement.

. 6. In a typewriting n'lachine, the combination of a power driven carriage; escapement devices including an escapement rack and an escapement dog; a pivoted and sliding dog rocker, and a spring to resist the sliding movement. of the dog rocker.

7. In a typewriting machine, the combina tion of a power driven -arriage, an escapement rac feed dogs cooperative therewith, a pivoted dog rocker which likewise n'iounted for movement in unison' with the carriage and under .the pressure of the power employed to move the carriage, and a spring which resists the movement of the dog rocker in unison with the carr'age.

8. In a typewriting machine, the combination of a power driven carriage, an escapemcnt rack, feed dogs cooperative therewith, a pivoted dog rocker which is likewise mountedfor sliding movement in unison with the carriage in the movement of the latter in a letter feed direction, and a spring which re-' sists such sliding movement of the dog 10. In a .typewriting machine, the combination of a ower driven carriage, an escapemelnt rac a ivoted dog r'tmker-mmlnted for a'xial well as for )ivotal movement, two feed dogs fixed to sait dog rocker, and a spring which resists the axial movement of said dog rocker. I

11. In a typewriting machine, the combination of a power driven carriage, an escapement rack, a pivoted dog rocker mounted for axial as Well as for pivotal move ment, two feed dogs fixed to said dog rocker andarranged to afford a half and half drop, and a spring which resists the axial movcrr'icnt of said dog rocker and absorbs theshockat each half drop of the .rack against a. dog.

12. In a typewriting machine, the combination of a power driven carria e, and escapement devices therefor whic afi'ord a free movement of the carriage during letter feed operations, a final point-of resistance for limitin the movement of the carriage in a letter eed direction through the escapement devices, and a cushion situated at said point of final resistance to receive and .ab-

sorb the shock incidental to the free letter feed movements of the carriage.

13. In a typewriting machine, the combnation of a. power driven carriage; escapement devices which aflord a free movement of the carriage during letter feed operations, said escapement devices including a feed dog, a dog rocker to which said dog. is rigidly secured, and a rack; a sprin means b which said spring is rendered e ective to a sorb the shock incidental to letter feed movements of the carriage; and means for limiting the fiexion of said spring.

14. In a typewriting machine, the eombination of a power driven carriage, escapement devices, a spring separate from said escapement devices, means whereby said spring is flexed and thereby arrests the letter feed movements of the carriage after the said escapement devices have been brought into engagement toarrest the carriage, and means for limiting a flexing of the spring when undue carria e.-

15. In a typewriting ma 1 'n'e, the co1nbination of a powerdrivenj .iage; escapement devices therefor inc g a holding dog, and a rack one f1 f-parts bein mounted for bodilyn evement after they are engaged to arrest the carriage; a spring pressure is exerted upon the,

separate from said movably mounted part andoperative to resist the movement thereof during the letter feed movements of the carriage and thus absorb the shock at the termination of the letter feed movements of the carriage; and means whereby a positive resistance is ofiered to prevent an-undue fiexure of the spring when undue pressure is exerted on .the carriage.

16. In a typewriting machine, the combination of a power driven carriage; escapement devices lncluding an escapement rack and an escarllement dog; a pivoted and sliding dog roc er, a spring to resist the sliding movement of the dog rocker, and means whereby a positive resistance is offered to the sliding movement of the dog rocker when undue pressure is exerted on the carrla e. i

q. In a typewriting machine, the combination of a ower driven carnage, an esca'p'ement, racii, feed do s cooperative therewitli', a (pivoted-dog roc er which is likewise moilnte for movement in'unison with the carriage, a spring which resists the movementof the dog rocker in unison with the carriage, and a stop for positively limiting the movement of the dog rocker in unison withthe carriage when undue pressureis exerted' .on the carriage.

fSlign'ed'at the borough of Manhattan, cit 0 ew York, in,the county of New Yo'r and State of New York, this 10th dayof March, A; D. 1910 ARTHUR W. SMITH. Witnesses: e

CHARLES E. SMITH.

E. M. WELLS. 

